一定

Every sort of spring has definite elasticity.

He doesn't keep regular office hours.

fixed production quota

specified rules and regulations

definite remuneration

She should absolutely be obeyed here.

I'll sure bring you that book next time, without fail.

I figured that he must have gotten lost.

Failure is not necessarily a bad thing.

feel quite certain/sure of winning

I had some previous acquaintance with the subject.

in a certain sense

under certain/given conditions

to a certain extent; to some extent/degree

a certain amount of sugar

attract a measure of attention

maintain a measured/respectful distance

It is a fair distance to the railway station from here.

occupy a fairly big share in the world market

win fairly good achievements

give due attention to; attach due importance to

play a proper role

reach a fairly high level